The new law, which was passed in May, significantly changes the atmosphere inside the coffeehouses, known for loud pulsating music, dark tinted windows and women dressed in in bikinis and lingerie -- and sometimes less -- serving rich Vietnamese coffee.

Concerned with the amount of illegal gambling in the cafes, more than 150 federal and local law enforcement officials raided the shops in March. Police seized 186 arcade machines they believed could be converted to gambling machines.

Recently, the department hand-delivered letters of intent in English and Vietnamese to various cafes.

So far, Nightengale said, the reaction from shop owners has been fairly positive.

"We haven’t had anybody say 'Oh we're not going to do it,' " he said.

Though the ordinance bans dark window tint and smoking inside the cafes, "the real emphasis is going to be the video arcade games and the attire of the waitresses," Nightengale said.

Officers will be trained within the next week, he said.

"In order for us to go out and enforce it, we have to teach the cops how to do it," he said.